Use your mouse to move the purple thing. Try keep the ball alive for as long as you can.

If you hit the green thing, you get an extra ball. If you hit the red thing, you turn red. When you're red, you can click on yourself to fire a pretzel.

Stuff will happen depending on what you hit. You get 10 points every second you stay alive, for each ball on the screen.

When you dire, you get a rank according to your score. Simple as that.